I was on the highway at about midnight and felt my brakes go to the floor as i was getting off the highway. I could still stop it by going to the floor. I pulled into a parking lot and saw smoke (probably brake fluid that came off the exhaust) and saw that one of my brake lines in the rear went out. It looks like it's the one sitting above the rear diff. The rear end was very loaded down with a full group of people when it happened. Is this just a brake line replacement or should i be worried about more? I was gonna take it to a shop soon anyways because my rear brakes are at 2mm so i was worried it was that at first but it doesnt seem like it was that.